Before compiling, you need a precompiled executable for "wgrib2".
We have used version wgrib2 2.0.3 downloaded September 19, 2019.
You will need to search for this software online and compile for your system.
The executable name should be "wgrib2" and should be placed in this directory
for the Makefile to find.

1. Type "make" to compile after you have setup your ../include.mk file.

2. Run sample executable like "dgrib-6.2.11" to see instructions on how to
   pre-process a single Grib-2 file.

3. Not all Grib reanalysis and forecast gridded datasets are accounted for.

   You can view the degribbing code in the files such as:
     src/dprep/dgrib2_main.f90   and
     src/lib/griber_grb2.c

   In these routines are the specfications for adding a new dataset. Grib
   names and numbers and labels can vary among datasets and each variation
   has to be customized as a new datatype.